Yeah yeah yeah... Kill him with kindness but when that fails or it just starts eatting at you that you did nothing to this dickhead for him to say anything about you, go to your local sporting goods store. In the hunting section you will find an asortment of scent attractants and scent cover ups. ie. skunk piss, fox piss, racoon piss, deer piss, doe estrus, buck seman... You get the picture... Now you can apply your selection in a number of ways just a little bit over time, all at one time (which might just drive you nuts if you're down wind) or my favorite injection into the rubber seals around his car windows. If you know anyone that has to take allergy shots or just has a drug problem get one of their syringes and give his car a dose of piss right in the drivers door.